Quote:
Originally Posted by Sirtel
It must be a very old Kindle, as even the Kindle Keyboard from 2010 can read azw3 files.
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The K3 is actually the oldest for azw3/KF8, and didn't read them till a backport firmware was available.
The DXG can't though the same age, because it is too much an earlier DX / K2 type design, just with an upgraded screen. It probably hasn't enough RAM.
The K1, K2 and DX only read plain mobi/KF7, which was hardly changed from when Amazon bought Mobipocket. The original azw is simply mobi with later Amazon DRM.
The PW3 got FW update for KFX. I don't know which older Kindles don't do KFX, but K3 doesn't.
KFX covers multiple formats internally.
Dual Mobi is mobi KF7 and azw3 KF8 in one file. It does seem to work at least on a DXG (gets mobi version). The K3 Aa menu seems to select original mobi (any not Publisher option) and azw3 in a dual mobi.
Any Kindle without a Publisher option in Aa is old mobi only.
The PW3 I have seems to ignore the old mobi in Dual mobi even if Publisher isn't selected in Aa, but will display actual old mobi.